A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. It is then disconnected from the battery and the plates are pulled apart to a separation 2d without discharging them
After the plates are 2d apart, the magnitude of the charge on the plates and the potential difference between them are what?
a.
b.
Q0, 
V0
c.
Q0, V0
d.
Q0, 2V0
e.
2Q0, 2V0
d
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Suppose you measure the parallax angle for a particular star to be 0.1 arcsecond. The distance to this star is
A) 10 light-years. B) 10 parsecs. C) 0.1 light-year. D) 0.1 parsec. E) impossible to determine.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
When charges qa, qb, and qc are placed respectively at the corners a, b, and c of a right triangle, the potential at the midpoint of the hypotenuse is 20 V. When the charge qa is removed, the potential at the midpoint becomes 15 V. When, instead, the charge qb is removed (qa and qc both in place), the potential at the midpoint becomes 12 V. What is the potential at the midpoint if only the charge
qc is removed from the array of charges? a. 8.0 V b. 5.0 V c. 7.0 V d. 13 V
An RLC series circuit has a 400
resistance, a 2.5 mH inductor, and a capacitor. If the circuit is in resonance at 30 kHz, what is the capacitive reactance?
a. 
b. 
c. 
D. 71 
E. 0.00